--- Makefile	(revision 285594)
+++ Makefile	(working copy)
@@ -5,7 +5,7 @@ 
 
 PROG=	pkill
 
-LIBADD=	kvm
+LIBADD=	kvm jail
 
 LINKS=	${BINDIR}/pkill ${BINDIR}/pgrep
 MLINKS=	pkill.1 pgrep.1
--- Makefile.depend	(revision 285594)
+++ Makefile.depend	(working copy)
@@ -9,6 +9,7 @@ DIRDEPS = \
 	lib/${CSU_DIR} \
 	lib/libc \
 	lib/libcompiler_rt \
+	lib/libjail \
 	lib/libkvm \
 
 
--- pkill.1	(revision 285594)
+++ pkill.1	(working copy)
@@ -47,7 +47,7 @@ 
 .Op Fl c Ar class
 .Op Fl d Ar delim
 .Op Fl g Ar pgrp
-.Op Fl j Ar jid
+.Op Fl j Ar jail
 .Op Fl s Ar sid
 .Op Fl t Ar tty
 .Op Fl u Ar euid
@@ -63,7 +63,7 @@ 
 .Op Fl U Ar uid
 .Op Fl c Ar class
 .Op Fl g Ar pgrp
-.Op Fl j Ar jid
+.Op Fl j Ar jail
 .Op Fl s Ar sid
 .Op Fl t Ar tty
 .Op Fl u Ar euid
@@ -149,16 +149,17 @@ or
 command.
 .It Fl i
 Ignore case distinctions in both the process table and the supplied pattern.
-.It Fl j Ar jid
-Restrict matches to processes inside jails with a jail ID in the comma-separated
-list
-.Ar jid .
-The value
+.It Fl j Ar jail
+Restrict matches to processes inside the specified jails.
+The argument
+.Ar jail
+may be
 .Dq Li any
-matches processes in any jail.
-The value
+to match processes in any jail,
 .Dq Li none
-matches processes not in jail.
+to match processes not in jail,
+or
+a comma-separated list of jail IDs or names.
 .It Fl l
 Long output.
 For
--- pkill.c	(revision 285594)
+++ pkill.c	(working copy)
@@ -59,6 +59,7 @@ __FBSDID("$FreeBSD$");
 #include <grp.h>
 #include <errno.h>
 #include <locale.h>
+#include <jail.h>
 
 #define	STATUS_MATCH	0
 #define	STATUS_NOMATCH	1
@@ -78,7 +79,7 @@ enum listtype {
 	LT_GROUP,
 	LT_TTY,
 	LT_PGRP,
-	LT_JID,
+	LT_JAIL,
 	LT_SID,
 	LT_CLASS
 };
@@ -245,7 +246,7 @@ main(int argc, char **argv)
 			cflags |= REG_ICASE;
 			break;
 		case 'j':
-			makelist(&jidlist, LT_JID, optarg);
+			makelist(&jidlist, LT_JAIL, optarg);
 			criteria = 1;
 			break;
 		case 'l':
@@ -585,7 +586,7 @@ usage(void)
 
 	fprintf(stderr,
 		"usage: %s %s [-F pidfile] [-G gid] [-M core] [-N system]\n"
-		"             [-P ppid] [-U uid] [-c class] [-g pgrp] [-j jid]\n"
+		"             [-P ppid] [-U uid] [-c class] [-g pgrp] [-j jail]\n"
 		"             [-s sid] [-t tty] [-u euid] pattern ...\n",
 		getprogname(), ustr);
 
@@ -700,7 +701,7 @@ makelist(struct listhead *head, enum listtype type
 				if (li->li_number == 0)
 					li->li_number = getsid(mypid);
 				break;
-			case LT_JID:
+			case LT_JAIL:
 				if (li->li_number < 0)
 					errx(STATUS_BADUSAGE,
 					     "Negative jail ID `%s'", sp);
@@ -766,15 +767,20 @@ foundtty:		if ((st.st_mode & S_IFCHR) == 0)
 
 			li->li_number = st.st_rdev;
 			break;
-		case LT_JID:
+		case LT_JAIL: {
+			int jid;
+
 			if (strcmp(sp, "none") == 0)
 				li->li_number = 0;
 			else if (strcmp(sp, "any") == 0)
 				li->li_number = -1;
+			else if ((jid = jail_getid(sp)) != -1)
+				li->li_number = jid;
 			else if (*ep != '\0')
 				errx(STATUS_BADUSAGE,
-				     "Invalid jail ID `%s'", sp);
+				     "Invalid jail ID or name `%s'", sp);
 			break;
+		}
 		case LT_CLASS:
 			li->li_number = -1;
 			li->li_name = strdup(sp);
--- tests/pgrep-j_test.sh	(revision 285594)
+++ tests/pgrep-j_test.sh	(working copy)
@@ -14,7 +14,7 @@ if [ `id -u` -ne 0 ]; then
 	exit 0
 fi
 
-echo "1..3"
+echo "1..4"
 
 sleep=$(pwd)/sleep.txt
 ln -sf /bin/sleep $sleep
@@ -87,5 +87,30 @@ else
 fi
 [ -f ${PWD}/${base}_3_1.pid ] && kill $(cat $PWD/${base}_3_1.pid) 
 [ -f ${PWD}/${base}_3_2.pid ] && kill $(cat $PWD/${base}_3_2.pid) 
+wait
 
+# test 4 is like test 1 except with jname instead of jid.
+name="pgrep -j <jname>"
+sleep_amount=8
+jail -c path=/ name=${base}_4_1 ip4.addr=127.0.0.1 \
+    command=daemon -p ${PWD}/${base}_4_1.pid $sleep $sleep_amount &
+
+jail -c path=/ name=${base}_4_2 ip4.addr=127.0.0.1 \
+    command=daemon -p ${PWD}/${base}_4_2.pid $sleep $sleep_amount &
+
+sleep 0.5
+
+jid="${base}_4_1,${base}_4_2"
+pid1="$(pgrep -f -x -j "$jid" "$sleep $sleep_amount" | sort)"
+pid2=$(printf "%s\n%s" "$(cat ${PWD}/${base}_4_1.pid)" \
+    $(cat ${PWD}/${base}_4_2.pid) | sort)
+if [ "$pid1" = "$pid2" ]; then
+	echo "ok 4 - $name"
+else
+	echo "not ok 4 - $name # pgrep output: '$(echo $pid1)', pidfile output: '$(echo $pid2)'"
+fi
+[ -f ${PWD}/${base}_4_1.pid ] && kill $(cat ${PWD}/${base}_4_1.pid)
+[ -f ${PWD}/${base}_4_2.pid ] && kill $(cat ${PWD}/${base}_4_2.pid)
+wait
+
 rm -f $sleep
--- tests/pkill-j_test.sh	(revision 285594)
+++ tests/pkill-j_test.sh	(working copy)
@@ -14,7 +14,7 @@ if [ `id -u` -ne 0 ]; then
 	exit 0
 fi
 
-echo "1..3"
+echo "1..4"
 
 sleep=$(pwd)/sleep.txt
 ln -sf /bin/sleep $sleep
@@ -90,5 +90,31 @@ else
 fi 2>/dev/null
 [ -f ${PWD}/${base}_3_1.pid ] && kill $(cat ${base}_3_1.pid)
 [ -f ${PWD}/${base}_3_2.pid ] && kill $(cat ${base}_3_2.pid)
+wait
 
+# test 4 is like test 1 except with jname instead of jid.
+name="pkill -j <jname>"
+sleep_amount=8
+jail -c path=/ name=${base}_4_1 ip4.addr=127.0.0.1 \
+    command=daemon -p ${PWD}/${base}_4_1.pid $sleep $sleep_amount &
+
+jail -c path=/ name=${base}_4_2 ip4.addr=127.0.0.1 \
+    command=daemon -p ${PWD}/${base}_4_2.pid $sleep $sleep_amount &
+
+$sleep $sleep_amount &
+
+sleep 0.5
+
+jid="${base}_4_1,${base}_4_2"
+if pkill -f -j "$jid" $sleep && sleep 0.5 &&
+    ! -f ${PWD}/${base}_4_1.pid &&
+    ! -f ${PWD}/${base}_4_2.pid ; then
+	echo "ok 4 - $name"
+else
+	echo "not ok 4 - $name"
+fi 2>/dev/null
+[ -f ${PWD}/${base}_4_1.pid ] && kill $(cat ${PWD}/${base}_4_1.pid)
+[ -f ${PWD}/${base}_4_2.pid ] && kill $(cat ${PWD}/${base}_4_2.pid)
+wait
+
 rm -f $sleep